66680553 has 4 divisors (see below), whose sum is σ = 88907408. Its totient is φ = 44453700.

The previous prime is 66680533. The next prime is 66680587. The reversal of 66680553 is 35508666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66680553 - 2⁵ = 66680521 is a prime.

It is a super-2 number, since 2×66680553² = 8892592296771618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66680513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11113423 + ... + 11113428.

It is an arithmetic number, because the mean of its divisors is an integer number (22226852).

Almost surely, 2^66680553 is an apocalyptic number.

It is an amenable number.

66680553 is a deficient number, since it is larger than the sum of its proper divisors (22226855).

66680553 is a wasteful number, since it uses less digits than its factorization.

66680553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22226854.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 66680553 is about 8165.8161257770. The cubic root of 66680553 is about 405.5082842452.

The spelling of 66680553 in words is "sixty-six million, six hundred eighty thousand, five hundred fifty-three".